Add dev firmware key to devkeys.

tests/devkeys/create_new_keys.sh

Index: tests/devkeys/create_new_keys.sh
diff --git a/tests/devkeys/create_new_keys.sh b/tests/devkeys/create_new_keys.sh
index 625fbc6c3cbd23c7c7cdcbb05776601dcffb04bb..311d92439cb4b8888ca27c2023f89dd9258b20d5 100755
--- a/tests/devkeys/create_new_keys.sh
+++ b/tests/devkeys/create_new_keys.sh
@@ -94,6 +94,7 @@ function make_keyblock {
 # Create the normal keypairs
 make_pair root_key                 11
 make_pair firmware_data_key        7
+make_pair dev_firmware_data_key    7
 make_pair kernel_subkey            7
 make_pair kernel_data_key          4
 
@@ -106,6 +107,9 @@ make_pair installer_kernel_data_key 11
 # since it's never even checked during Recovery mode.
 make_keyblock firmware 7 firmware_data_key root_key
 
+# Create the dev firmware keyblock for use only in Developer mode.
+make_keyblock dev_firmware 6 dev_firmware_data_key root_key
+
 # Create the recovery kernel keyblock for use only in Recovery mode.
 make_keyblock recovery_kernel 11 recovery_kernel_data_key recovery_key